function validateEmail() {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = document.getElementById('ea').value;
   if(reg.test(address) == false) {
      alert('Email address ' + address + ' is invalid. \n\nPlease try again.');
      return false;
   } else {
	  setTimeout('document.getElementById(\'ea\').value = \'\';',1000);
	  return true;
   }
}